Subject: Bleed CIS System if Fuel Lines are Opened Models: 911/924 ALL

Bulletin Number: 77 – 02

Bleeding of system is necessary if, during CIS repairs, any fuel lines are loosened or removed.

CIS bleeding operation

• Remove all injectors at engine

• Place injectors in Tester US4480.
• Remove rubber elbow from top if air flow sensor

• Remove fuel pump relay at fuse/relay panel and install jumper switch adapter US4480/3
• Switch fuel pump on with switch on US4480/03
• Move airflow sensor plate up and down over its full travel for approximately 2 minutes
• Switch off fuel pump
• Reinstall rubber elbow over sensor plate
• Reinstall fuel pump relay on fuse/relay panel

• Re-insert injectors in engine (use new rubber seals, Part No. 063.133.557)
• Pour accumulated fuel in tubes of US4480 back into fuel tank.
• Start engine and check for proper operation.